George juengst



G. JUENGST.

Dynamometer.

Patented Dec. 22. 1857.

:4. mas Phowlilho nphlr. Wm. M;

UNITED STAWENT GEORGE JUENGST, OF NEW YORK, N. Y.

.DYNAMOMETER.

Specification of Letters Patent No. 18,908, dated December 22, 1857.

To all whom it may concern:

Be it known that I, GEORGE JUENcs'r, of the city, county, and State ofNew York, have invented a new and improved self-acting dynamometer(power-meter) by which the power exerted by a belt and pulley on a shaftor by the shaft on the pulley may be measured and registered; and Ihereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, Figure 1 representing a longitudinal;Fig. 2 a lateral section through the central lines of the apparatus.

B is the pulley with its spokes; its hub rests loosely on the tube Z,which is fastened to the shaft A, and bears the support C. This supportconsists of two parallel, slotted plates and has at one end one or morespiral springs g, at the other a roller E. The slots of the supportserve as guides for the sliding frame D which consists of two parallelplates sliding along the sides of the support without touching the shaftand connected by crosspieces d and p; the latter p presses against thespring or springs of the support; to the other crosspiece (Z the end ofthe belt R is attached so as to run between the sides of the support Cand over the roller E. This belt R is fastened at a point H to theinside of the pulley B so that if the pulley is turned in the directionof the arrow in Fig. 1, it will pull on the belt and on the springs,till the pressure on the roller E is suflicient to turn the support andwith it the shaft A. To the sliding frame D is a ring F attached onwhich another ring a (Fig. 2) turns freely; n is connected by the rod Iwith the adjustable lever K and nip ping pawl m, by which the disk Lwith its shaft a may be turned; the shaft a has an arm, which may beconnected with a count ing apparatus or register of common construction(not shown in the drawings). The disk L and the counting apparatus arearranged on a hanger H which is suspended from the shaft A. The ring Fis so arranged that it is concentric with the shaft A if the apparatusis at rest, but will become eccentric more or less, if the sliding frameis set in motion by a power pulling on the belt R.

The operation of this contrivance is the following. Suppose a belt to bearranged over the pulley B so as to turn it with power in the directionof the arrow in Fig. 1. The pulley, which turns with its hub loosely onthe tube Z, next pulls on the belt R which drawing the sliding frame Dcompresses the spring or springs 9, till the force applied is sufiicientto overcome the resistance of the shaft by the corresponding pressure onthe support roller E. The more power the pulley has to give out for thispurpose, the farther the belt R will be drawn from the support, thesprings, the more compressed, and the sliding frame with its ring F willbe removed from its original position, so that the ring F will standmore or less eccentric to the shaft A, in exact proportion to the powerworking on the pulley. According to the degree of eccentricity the rod fand lever with the disk L will be moved more or less and with it theattached registering apparatus. On lessening the power the spring 9 willmove the sliding frame with its appurtenances more toward the originalposition, make the movements of the lever smaller and work accordinglyon the registering apparatus.

In order to find the amount of power which has been exerted by thepulley, it is necessary to know the number of strokes, each of one inch,which the rod f has to make for revolving the disk L once; further theweight in pounds which is required on pulley B to span or compress thespring g for half an inch (the distance corresponding to a one inchstroke of rod f); lastly the circumference of the pulley in inches;these three data multiplied give as product the measure of the powerworking in inchpounds. For instance it takes 50 strokes of rod f, eachof one inch, to revolve the disk L once; 100 pounds have to work on theperiphery of B to compress the spring for inch; the periphery of B is 75 inches. 75 100 50=375000 inch pounds or 31240 foot pounds, the measureof the power absorbed or given out from the pulley during the time ofone revolution of the disk.

The registering apparatus has of course to be constructed accordingly.

What I claim as my invention and desire to have secured by LettersPatent is The connection of the loose pulley B with belt R, the supportC with the spring 9, sliding frame D with ring F and the connection of Fwith disk L by lever and nipping pawl and with a counting apparatus, 7

or their several equivalents, by which ar- 10 rangement the amount ofworking power is registered for the whole tune of 1ts action,

- C. HARTMANN,

JUL. E. SGHWABE.

